CHEMICAL ENGINEERING

Question: Gas turbine normally employs a constant __________ cycle.
[A].

pressure

[B].

temperature

[C].

volume

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about
[A].

9:1

[B].

17 : 1

[C].

23 : 1

[D].

29 : 1

Answer: Option B

Explanation:

No answer description available for this question.

Question: Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be
[A].

9.5:1

[B].

12.5:1

[C].

15.5 :1

[D].

18.5 : 1

Answer: Option A

Explanation:

No answer description available for this question.

Question: A coal with high __________ content will ignite most easily.
[A].

hydrogen

[B].

oxygen

[C].

volatile matter

[D].

fixed carbon

Answer: Option C

Explanation:

No answer description available for this question.

Question: With decrease in the grain size of a material, its creep resistance
[A].

increases.

[B].

decreases.

[C].

remains constant.

[D].

either (a) or (b) ; depends on the material.

Answer: Option C

Explanation:

No answer description available for this question.

Question: In cold working of metal as compared to its hot working
[A].

cracks and blow holes are eliminated.

[B].

ductility and impact strength improves.

[C].

appreciable strain hardening is produced.

[D].

yield stress, hardness and fatigue strength is not at all affected.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding
[A].

glycerol

[B].

nitro cellulose

[C].

camphor

[D].

none of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: No cutting fluid is normally used, while machining
[A].

cast iron

[B].

aluminium

[C].

mild steel

[D].

stainless steel

Answer: Option A

Explanation:

No answer description available for this question.

Question: Ceramic materials are
[A].

organic in nature.

[B].

stronger in compression than in tension.

[C].

always amorphous in nature.

[D].

always bad heat conductors.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Heating the hypoeutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called
[A].

tempering

[B].

hardening

[C].

annealing

[D].

normalising

Answer: Option C

Explanation:

No answer description available for this question.